| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: bsdf2klems.c,v 2.6 2013/06/29 21:03:25 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Load measured BSDF interpolant and write out as XML file with Klems matrix. |
| 6 |
* |
| 7 |
* G. Ward |
| 8 |
*/ |
| 9 |
|
| 10 |
#define _USE_MATH_DEFINES |
| 11 |
#include <stdio.h> |
| 12 |
#include <stdlib.h> |
| 13 |
#include <string.h> |
| 14 |
#include <math.h> |
| 15 |
#include "random.h" |
| 16 |
#include "platform.h" |
| 17 |
#include "calcomp.h" |
| 18 |
#include "bsdfrep.h" |
| 19 |
#include "bsdf_m.h" |
| 20 |
/* assumed maximum # Klems patches */ |
| 21 |
#define MAXPATCHES 145 |
| 22 |
/* global argv[0] */ |
| 23 |
char *progname; |
| 24 |
/* selected basis function name */ |
| 25 |
static const char *kbasis = "LBNL/Klems Full"; |
| 26 |
/* number of BSDF samples per patch */ |
| 27 |
static int npsamps = 256; |
| 28 |
|
| 29 |
/* Return angle basis corresponding to the given name */ |
| 30 |
ANGLE_BASIS * |
| 31 |
get_basis(const char *bn) |
| 32 |
{ |
| 33 |
int n = nabases; |
| 34 |
|
| 35 |
while (n-- > 0) |
| 36 |
if (!strcasecmp(bn, abase_list[n].name)) |
| 37 |
return &abase_list[n]; |
| 38 |
return NULL; |
| 39 |
} |
| 40 |
|
| 41 |
/* Output XML header to stdout */ |
| 42 |
static void |
| 43 |
xml_header(int ac, char *av[]) |
| 44 |
{ |
| 45 |
puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
| 46 |
puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">"); |
| 47 |
fputs("<!-- File produced by:", stdout); |
| 48 |
while (ac-- > 0) { |
| 49 |
fputc(' ', stdout); |
| 50 |
fputs(*av++, stdout); |
| 51 |
} |
| 52 |
puts(" -->"); |
| 53 |
} |
| 54 |
|
| 55 |
/* Output XML prologue to stdout */ |
| 56 |
static void |
| 57 |
xml_prologue(const SDData *sd) |
| 58 |
{ |
| 59 |
const char *matn = (sd && sd->matn[0]) ? sd->matn : "Name"; |
| 60 |
const char *makr = (sd && sd->makr[0]) ? sd->makr : "Manufacturer"; |
| 61 |
ANGLE_BASIS *abp = get_basis(kbasis); |
| 62 |
int i; |
| 63 |
|
| 64 |
if (abp == NULL) { |
| 65 |
fprintf(stderr, "%s: unknown angle basis '%s'\n", progname, kbasis); |
| 66 |
exit(1); |
| 67 |
} |
| 68 |
puts("<WindowElementType>System</WindowElementType>"); |
| 69 |
puts("<FileType>BSDF</FileType>"); |
| 70 |
puts("<Optical>"); |
| 71 |
puts("<Layer>"); |
| 72 |
puts("\t<Material>"); |
| 73 |
printf("\t\t<Name>%s</Name>\n", matn); |
| 74 |
printf("\t\t<Manufacturer>%s</Manufacturer>\n", makr); |
| 75 |
if (sd && sd->dim[2] > .001) { |
| 76 |
printf("\t\t<Thickness unit=\"meter\">%.3f</Thickness>\n", sd->dim[2]); |
| 77 |
printf("\t\t<Width unit=\"meter\">%.3f</Width>\n", sd->dim[0]); |
| 78 |
printf("\t\t<Height unit=\"meter\">%.3f</Height>\n", sd->dim[1]); |
| 79 |
} |
| 80 |
puts("\t\t<DeviceType>Other</DeviceType>"); |
| 81 |
puts("\t</Material>"); |
| 82 |
if (sd && sd->mgf != NULL) { |
| 83 |
puts("\t<Geometry format=\"MGF\">"); |
| 84 |
puts("\t\t<MGFblock unit=\"meter\">"); |
| 85 |
fputs(sd->mgf, stdout); |
| 86 |
puts("</MGFblock>"); |
| 87 |
puts("\t</Geometry>"); |
| 88 |
} |
| 89 |
puts("\t<DataDefinition>"); |
| 90 |
puts("\t\t<IncidentDataStructure>Columns</IncidentDataStructure>"); |
| 91 |
puts("\t\t<AngleBasis>"); |
| 92 |
printf("\t\t\t<AngleBasisName>%s</AngleBasisName>\n", kbasis); |
| 93 |
for (i = 0; abp->lat[i].nphis; i++) { |
| 94 |
puts("\t\t\t<AngleBasisBlock>"); |
| 95 |
printf("\t\t\t<Theta>%g</Theta>\n", i ? |
| 96 |
.5*(abp->lat[i].tmin + abp->lat[i+1].tmin) : |
| 97 |
.0 ); |
| 98 |
printf("\t\t\t<nPhis>%d</nPhis>\n", abp->lat[i].nphis); |
| 99 |
puts("\t\t\t<ThetaBounds>"); |
| 100 |
printf("\t\t\t\t<LowerTheta>%g</LowerTheta>\n", abp->lat[i].tmin); |
| 101 |
printf("\t\t\t\t<UpperTheta>%g</UpperTheta>\n", abp->lat[i+1].tmin); |
| 102 |
puts("\t\t\t</ThetaBounds>"); |
| 103 |
puts("\t\t\t</AngleBasisBlock>"); |
| 104 |
} |
| 105 |
puts("\t\t</AngleBasis>"); |
| 106 |
puts("\t</DataDefinition>"); |
| 107 |
} |
| 108 |
|
| 109 |
/* Output XML data prologue to stdout */ |
| 110 |
static void |
| 111 |
data_prologue() |
| 112 |
{ |
| 113 |
static const char *bsdf_type[4] = { |
| 114 |
"Reflection Front", |
| 115 |
"Transmission Front", |
| 116 |
"Transmission Back", |
| 117 |
"Reflection Back" |
| 118 |
}; |
| 119 |
|
| 120 |
puts("\t<WavelengthData>"); |
| 121 |
puts("\t\t<LayerNumber>System</LayerNumber>"); |
| 122 |
puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>"); |
| 123 |
puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>"); |
| 124 |
puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>"); |
| 125 |
puts("\t\t<WavelengthDataBlock>"); |
| 126 |
printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n", |
| 127 |
bsdf_type[(input_orient>0)<<1 | (output_orient>0)]); |
| 128 |
printf("\t\t\t<ColumnAngleBasis>%s</ColumnAngleBasis>\n", kbasis); |
| 129 |
printf("\t\t\t<RowAngleBasis>%s</RowAngleBasis>\n", kbasis); |
| 130 |
puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>"); |
| 131 |
puts("\t\t\t<ScatteringData>"); |
| 132 |
} |
| 133 |
|
| 134 |
/* Output XML data epilogue to stdout */ |
| 135 |
static void |
| 136 |
data_epilogue(void) |
| 137 |
{ |
| 138 |
puts("\t\t\t</ScatteringData>"); |
| 139 |
puts("\t\t</WavelengthDataBlock>"); |
| 140 |
puts("\t</WavelengthData>"); |
| 141 |
} |
| 142 |
|
| 143 |
/* Output XML epilogue to stdout */ |
| 144 |
static void |
| 145 |
xml_epilogue(void) |
| 146 |
{ |
| 147 |
puts("</Layer>"); |
| 148 |
puts("</Optical>"); |
| 149 |
puts("</WindowElement>"); |
| 150 |
} |
| 151 |
|
| 152 |
/* Load and resample XML BSDF description using Klems basis */ |
| 153 |
static void |
| 154 |
eval_bsdf(const char *fname) |
| 155 |
{ |
| 156 |
ANGLE_BASIS *abp = get_basis(kbasis); |
| 157 |
float *trans_mtx = NULL; |
| 158 |
SDData bsd; |
| 159 |
SDError ec; |
| 160 |
FVECT vin, vout; |
| 161 |
SDValue sv; |
| 162 |
double sum; |
| 163 |
int i, j, n; |
| 164 |
|
| 165 |
SDclearBSDF(&bsd, fname); /* load BSDF file */ |
| 166 |
if ((ec = SDloadFile(&bsd, fname)) != SDEnone) |
| 167 |
goto err; |
| 168 |
xml_prologue(&bsd); /* pass geometry */ |
| 169 |
/* front reflection */ |
| 170 |
if (bsd.rf != NULL || bsd.rLambFront.cieY > .002) { |
| 171 |
input_orient = 1; output_orient = 1; |
| 172 |
data_prologue(); |
| 173 |
for (j = 0; j < abp->nangles; j++) { |
| 174 |
for (i = 0; i < abp->nangles; i++) { |
| 175 |
sum = 0; /* average over patches */ |
| 176 |
for (n = npsamps; n-- > 0; ) { |
| 177 |
fo_getvec(vout, j+(n+frandom())/npsamps, abp); |
| 178 |
fi_getvec(vin, i+urand(n), abp); |
| 179 |
ec = SDevalBSDF(&sv, vout, vin, &bsd); |
| 180 |
if (ec != SDEnone) |
| 181 |
goto err; |
| 182 |
sum += sv.cieY; |
| 183 |
} |
| 184 |
printf("\t%.3e\n", sum/npsamps); |
| 185 |
} |
| 186 |
putchar('\n'); /* extra space between rows */ |
| 187 |
} |
| 188 |
data_epilogue(); |
| 189 |
} |
| 190 |
/* back reflection */ |
| 191 |
if (bsd.rb != NULL || bsd.rLambBack.cieY > .002) { |
| 192 |
input_orient = -1; output_orient = -1; |
| 193 |
data_prologue(); |
| 194 |
for (j = 0; j < abp->nangles; j++) { |
| 195 |
for (i = 0; i < abp->nangles; i++) { |
| 196 |
sum = 0; /* average over patches */ |
| 197 |
for (n = npsamps; n-- > 0; ) { |
| 198 |
bo_getvec(vout, j+(n+frandom())/npsamps, abp); |
| 199 |
bi_getvec(vin, i+urand(n), abp); |
| 200 |
ec = SDevalBSDF(&sv, vout, vin, &bsd); |
| 201 |
if (ec != SDEnone) |
| 202 |
goto err; |
| 203 |
sum += sv.cieY; |
| 204 |
} |
| 205 |
printf("\t%.3e\n", sum/npsamps); |
| 206 |
} |
| 207 |
putchar('\n'); /* extra space between rows */ |
| 208 |
} |
| 209 |
data_epilogue(); |
| 210 |
} |
| 211 |
/* front transmission */ |
| 212 |
if (bsd.tf != NULL || bsd.tLamb.cieY > .002) { |
| 213 |
if (bsd.tb == NULL) |
| 214 |
trans_mtx = (float *)malloc(sizeof(float) * |
| 215 |
abp->nangles*abp->nangles); |
| 216 |
input_orient = 1; output_orient = -1; |
| 217 |
data_prologue(); |
| 218 |
for (j = 0; j < abp->nangles; j++) { |
| 219 |
for (i = 0; i < abp->nangles; i++) { |
| 220 |
sum = 0; /* average over patches */ |
| 221 |
for (n = npsamps; n-- > 0; ) { |
| 222 |
bo_getvec(vout, j+(n+frandom())/npsamps, abp); |
| 223 |
fi_getvec(vin, i+urand(n), abp); |
| 224 |
ec = SDevalBSDF(&sv, vout, vin, &bsd); |
| 225 |
if (ec != SDEnone) |
| 226 |
goto err; |
| 227 |
sum += sv.cieY; |
| 228 |
} |
| 229 |
printf("\t%.3e\n", sum/npsamps); |
| 230 |
if (trans_mtx != NULL) |
| 231 |
trans_mtx[j*abp->nangles + i] = sum/npsamps; |
| 232 |
} |
| 233 |
putchar('\n'); /* extra space between rows */ |
| 234 |
} |
| 235 |
data_epilogue(); |
| 236 |
} |
| 237 |
/* back transmission */ |
| 238 |
if (bsd.tb != NULL || trans_mtx != NULL) { |
| 239 |
if (bsd.tf == NULL) |
| 240 |
trans_mtx = (float *)malloc(sizeof(float) * |
| 241 |
abp->nangles*abp->nangles); |
| 242 |
input_orient = -1; output_orient = 1; |
| 243 |
data_prologue(); |
| 244 |
for (j = 0; j < abp->nangles; j++) { |
| 245 |
for (i = 0; i < abp->nangles; i++) |
| 246 |
if (bsd.tb != NULL) { /* use tb if we have it */ |
| 247 |
sum = 0; /* average over patches */ |
| 248 |
for (n = npsamps; n-- > 0; ) { |
| 249 |
fo_getvec(vout, j+(n+frandom())/npsamps, abp); |
| 250 |
bi_getvec(vin, i+urand(n), abp); |
| 251 |
ec = SDevalBSDF(&sv, vout, vin, &bsd); |
| 252 |
if (ec != SDEnone) |
| 253 |
goto err; |
| 254 |
sum += sv.cieY; |
| 255 |
} |
| 256 |
printf("\t%.3e\n", sum/npsamps); |
| 257 |
if (trans_mtx != NULL) |
| 258 |
trans_mtx[i*abp->nangles + j] = sum/npsamps; |
| 259 |
} else { /* else transpose tf */ |
| 260 |
printf("\t%.3e\n", trans_mtx[i*abp->nangles + j]); |
| 261 |
} |
| 262 |
putchar('\n'); /* extra space between rows */ |
| 263 |
} |
| 264 |
data_epilogue(); |
| 265 |
} |
| 266 |
/* derived front transmission */ |
| 267 |
if (bsd.tf == NULL && trans_mtx != NULL) { |
| 268 |
input_orient = 1; output_orient = -1; |
| 269 |
data_prologue(); |
| 270 |
for (j = 0; j < abp->nangles; j++) { |
| 271 |
for (i = 0; i < abp->nangles; i++) |
| 272 |
printf("\t%.3e\n", trans_mtx[j*abp->nangles + i]); |
| 273 |
putchar('\n'); /* extra space between rows */ |
| 274 |
} |
| 275 |
data_epilogue(); |
| 276 |
} |
| 277 |
SDfreeBSDF(&bsd); /* all done */ |
| 278 |
if (trans_mtx != NULL) |
| 279 |
free(trans_mtx); |
| 280 |
return; |
| 281 |
err: |
| 282 |
SDreportError(ec, stderr); |
| 283 |
exit(1); |
| 284 |
} |
| 285 |
|
| 286 |
/* Interpolate and output a BSDF function using Klems basis */ |
| 287 |
static void |
| 288 |
eval_function(char *funame) |
| 289 |
{ |
| 290 |
ANGLE_BASIS *abp = get_basis(kbasis); |
| 291 |
double iovec[6]; |
| 292 |
double sum; |
| 293 |
int i, j, n; |
| 294 |
|
| 295 |
initurand(npsamps); |
| 296 |
data_prologue(); /* begin output */ |
| 297 |
for (j = 0; j < abp->nangles; j++) { /* run through directions */ |
| 298 |
for (i = 0; i < abp->nangles; i++) { |
| 299 |
sum = 0; |
| 300 |
for (n = npsamps; n--; ) { /* average over patches */ |
| 301 |
if (output_orient > 0) |
| 302 |
fo_getvec(iovec+3, j+(n+frandom())/npsamps, abp); |
| 303 |
else |
| 304 |
bo_getvec(iovec+3, j+(n+frandom())/npsamps, abp); |
| 305 |
|
| 306 |
if (input_orient > 0) |
| 307 |
fi_getvec(iovec, i+urand(n), abp); |
| 308 |
else |
| 309 |
bi_getvec(iovec, i+urand(n), abp); |
| 310 |
|
| 311 |
sum += funvalue(funame, 6, iovec); |
| 312 |
} |
| 313 |
printf("\t%.3e\n", sum/npsamps); |
| 314 |
} |
| 315 |
putchar('\n'); |
| 316 |
} |
| 317 |
data_epilogue(); /* finish output */ |
| 318 |
} |
| 319 |
|
| 320 |
/* Interpolate and output a radial basis function BSDF representation */ |
| 321 |
static void |
| 322 |
eval_rbf(void) |
| 323 |
{ |
| 324 |
ANGLE_BASIS *abp = get_basis(kbasis); |
| 325 |
float bsdfarr[MAXPATCHES*MAXPATCHES]; |
| 326 |
FVECT vin, vout; |
| 327 |
RBFNODE *rbf; |
| 328 |
double sum; |
| 329 |
int i, j, n; |
| 330 |
/* sanity check */ |
| 331 |
if (abp->nangles > MAXPATCHES) { |
| 332 |
fprintf(stderr, "%s: too many patches!\n", progname); |
| 333 |
exit(1); |
| 334 |
} |
| 335 |
data_prologue(); /* begin output */ |
| 336 |
for (i = 0; i < abp->nangles; i++) { |
| 337 |
if (input_orient > 0) /* use incident patch center */ |
| 338 |
fi_getvec(vin, i+.5*(i>0), abp); |
| 339 |
else |
| 340 |
bi_getvec(vin, i+.5*(i>0), abp); |
| 341 |
|
| 342 |
rbf = advect_rbf(vin); /* compute radial basis func */ |
| 343 |
|
| 344 |
for (j = 0; j < abp->nangles; j++) { |
| 345 |
sum = 0; /* sample over exiting patch */ |
| 346 |
for (n = npsamps; n--; ) { |
| 347 |
if (output_orient > 0) |
| 348 |
fo_getvec(vout, j+(n+frandom())/npsamps, abp); |
| 349 |
else |
| 350 |
bo_getvec(vout, j+(n+frandom())/npsamps, abp); |
| 351 |
|
| 352 |
sum += eval_rbfrep(rbf, vout) / vout[2]; |
| 353 |
} |
| 354 |
bsdfarr[j*abp->nangles + i] = sum*output_orient/npsamps; |
| 355 |
} |
| 356 |
if (rbf != NULL) |
| 357 |
free(rbf); |
| 358 |
} |
| 359 |
n = 0; /* write out our matrix */ |
| 360 |
for (j = 0; j < abp->nangles; j++) { |
| 361 |
for (i = 0; i < abp->nangles; i++) |
| 362 |
printf("\t%.3e\n", bsdfarr[n++]); |
| 363 |
putchar('\n'); |
| 364 |
} |
| 365 |
data_epilogue(); /* finish output */ |
| 366 |
} |
| 367 |
|
| 368 |
/* Read in BSDF and interpolate as Klems matrix representation */ |
| 369 |
int |
| 370 |
main(int argc, char *argv[]) |
| 371 |
{ |
| 372 |
int dofwd = 0, dobwd = 1; |
| 373 |
char *cp; |
| 374 |
int i, na; |
| 375 |
|
| 376 |
progname = argv[0]; |
| 377 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
| 378 |
esupport &= ~(E_INCHAN|E_OUTCHAN); |
| 379 |
scompile("PI:3.14159265358979323846", NULL, 0); |
| 380 |
biggerlib(); |
| 381 |
for (i = 1; i < argc && (argv[i][0] == '-') | (argv[i][0] == '+'); i++) |
| 382 |
switch (argv[i][1]) { /* get options */ |
| 383 |
case 'n': |
| 384 |
npsamps = atoi(argv[++i]); |
| 385 |
if (npsamps <= 0) |
| 386 |
goto userr; |
| 387 |
break; |
| 388 |
case 'e': |
| 389 |
scompile(argv[++i], NULL, 0); |
| 390 |
single_plane_incident = 0; |
| 391 |
break; |
| 392 |
case 'f': |
| 393 |
if (!argv[i][2]) { |
| 394 |
fcompile(argv[++i]); |
| 395 |
single_plane_incident = 0; |
| 396 |
} else |
| 397 |
dofwd = (argv[i][0] == '+'); |
| 398 |
break; |
| 399 |
case 'b': |
| 400 |
dobwd = (argv[i][0] == '+'); |
| 401 |
break; |
| 402 |
case 'h': |
| 403 |
kbasis = "LBNL/Klems Half"; |
| 404 |
break; |
| 405 |
case 'q': |
| 406 |
kbasis = "LBNL/Klems Quarter"; |
| 407 |
break; |
| 408 |
default: |
| 409 |
goto userr; |
| 410 |
} |
| 411 |
if (single_plane_incident >= 0) { /* function-based BSDF? */ |
| 412 |
if (i != argc-1 || fundefined(argv[i]) != 6) { |
| 413 |
fprintf(stderr, |
| 414 |
"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n", |
| 415 |
progname); |
| 416 |
goto userr; |
| 417 |
} |
| 418 |
xml_header(argc, argv); /* start XML output */ |
| 419 |
xml_prologue(NULL); |
| 420 |
if (dofwd) { |
| 421 |
input_orient = -1; |
| 422 |
output_orient = -1; |
| 423 |
eval_function(argv[i]); /* outside reflectance */ |
| 424 |
output_orient = 1; |
| 425 |
eval_function(argv[i]); /* outside -> inside */ |
| 426 |
} |
| 427 |
if (dobwd) { |
| 428 |
input_orient = 1; |
| 429 |
output_orient = 1; |
| 430 |
eval_function(argv[i]); /* inside reflectance */ |
| 431 |
output_orient = -1; |
| 432 |
eval_function(argv[i]); /* inside -> outside */ |
| 433 |
} |
| 434 |
xml_epilogue(); /* finish XML output & exit */ |
| 435 |
return(0); |
| 436 |
} |
| 437 |
/* XML input? */ |
| 438 |
if (i == argc-1 && (cp = argv[i]+strlen(argv[i])-4) > argv[i] && |
| 439 |
!strcasecmp(cp, ".xml")) { |
| 440 |
xml_header(argc, argv); /* start XML output */ |
| 441 |
eval_bsdf(argv[i]); /* load & resample BSDF */ |
| 442 |
xml_epilogue(); /* finish XML output & exit */ |
| 443 |
return(0); |
| 444 |
} |
| 445 |
if (i < argc) { /* open input files if given */ |
| 446 |
int nbsdf = 0; |
| 447 |
for ( ; i < argc; i++) { /* interpolate each component */ |
| 448 |
FILE *fpin = fopen(argv[i], "rb"); |
| 449 |
if (fpin == NULL) { |
| 450 |
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
| 451 |
progname, argv[i]); |
| 452 |
return(1); |
| 453 |
} |
| 454 |
if (!load_bsdf_rep(fpin)) |
| 455 |
return(1); |
| 456 |
fclose(fpin); |
| 457 |
if (!nbsdf++) { /* start XML on first dist. */ |
| 458 |
xml_header(argc, argv); |
| 459 |
xml_prologue(NULL); |
| 460 |
} |
| 461 |
eval_rbf(); |
| 462 |
} |
| 463 |
xml_epilogue(); /* finish XML output & exit */ |
| 464 |
return(0); |
| 465 |
} |
| 466 |
SET_FILE_BINARY(stdin); /* load from stdin */ |
| 467 |
if (!load_bsdf_rep(stdin)) |
| 468 |
return(1); |
| 469 |
xml_header(argc, argv); /* start XML output */ |
| 470 |
xml_prologue(NULL); |
| 471 |
eval_rbf(); /* resample dist. */ |
| 472 |
xml_epilogue(); /* finish XML output & exit */ |
| 473 |
return(0); |
| 474 |
userr: |
| 475 |
fprintf(stderr, |
| 476 |
"Usage: %s [-n spp][-h|-q][bsdf.sir ..] > bsdf.xml\n", progname); |
| 477 |
fprintf(stderr, |
| 478 |
" or: %s [-n spp][-h|-q] bsdf_in.xml > bsdf_out.xml\n", progname); |
| 479 |
fprintf(stderr, |
| 480 |
" or: %s [-n spp][-h|-q][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n", |
| 481 |
progname); |
| 482 |
return(1); |
| 483 |
} |
